I’m sorry but I get it is good and it is impressive but incredibly space inefficient and in its current state *not automatic* it is currently the most inefficient manual gearbox, an automatic transmission changes the gears automatically when the motor reaches maximum speed in the current ratio therefore it will Gear up to a higher gear ratio. for example it will *automatically* change from a 16:10 tooth ratio to maybe an 18:8 ratio or it could be 8:18 up to a 10:16. the point is he has no automatic transmission because he is having to manually change gears so you might as well build a far more compact and space efficient design to a 6 speed manual transmission. I recommend a video by Dgustafsson13 where he has a rather compact and very clever 6 speed manual transmission in Lego technic. I don’t mean to bang on but the Amount of gears in this assembly and the distance the energy has to travel through these gears make the drivetrain very inefficient. As the energy output from your PF XL motor travels through the gears energy is transferred and therefore lost, this is done by the gears moving and against with each other creating noise which is a transfer from kenetic energy ( the one you want) to sound which means you’re output power is less than your input. If you reduce the size and reduce the amount of gears and distance between the motor (input) the gearbox (transmission) to the axle or axles (output) you have less cubic area to dissipate energy which means you loss less to noise, friction and thermal energy, thus deeming your vehicle powerful and reliable.

@@sward5090 ok

@@sward5090 This imitates a planetary gearbox. It *is* used in automatic transmissions. In newer vehicules, the gear changing is controlled by a computer. In older vehicules it was controlled by vacuum in carburator or by centrifugal force. In this video, the person is the computer.

@@sward5090 what I got from this is your lack of imagination 😂 it was more a demonstration of how the automatic transmission works, SPECIFICALLY WHEN CHANGING GEARS, it wasn’t a comprehensive explanation

@@MrT------5743 it’s not itself an automatic transmission, but it’s a demonstration of how an automatic transmission changes gears. A manual transmission looks and works very differently than this. I don’t understand why you people are treating this like it’s a product being sold in a car, it’s literally just a demonstration of changing gears. The “automatic” part was controlled by the guy instead of a computer.

It's pretty obvious what it does, isn't it?

@@hobbified It's a gear box and that's just about all you can tell in this short and mysterious flick.

I mean it’s obviously a transmission for a car so it makes it move faster or move backwards

Me too

It’s what’s in your car

its a transmission tho, he should make an engine next tho and pair it with the transmission he should just make a whole car

youre welcome!

Not quite right, actual Automatic transmissions use many many clutch packs

Yeah, it's not auto since he needs to manually move stuff. It's still cool though!

Well what he means by auto is that it’s the same construction as an automatic transmission in an automobile. What he does by choosing locks and inputs is the same in what a computer does in auto trans car

automatic transmission is stupidly complex, in this sense. and is impossible to recreate using lego so people have to get creative

@@redfox435cat what you said. Older transmissions relied on vacuum pressure, rotational speed and a series of check balls to determine a shift. The newer ones do exactly what hes doing..

The "automatic" is just the computer input. The gears are exactly as in the automatic car transmission. The other thing missing here is the double clutch so he wouldn't be able to shift between very fast gears.

Well seeing as torque converters need atf to work I’d say no, how would you get the opposite vanes to spin free from each other and also seal the atf inside. Also for this to be a true automatic it needs a valve body and tons of ball valves.

L"

You are missing the point.

This is the design of an automatic transmission though this one is not “automatic” because they are usually controlled by a computer and hydraulic actuators

@Opecuted no, that functions of rather different principles, and requires an outside mechanism to regulate the gear ratio

@Opecuted that's right

Hello dr doak

That's exactly what I was thinking. It's got 3 inputs so 3 bits = 8 states. There are 6 different speeds, reverse and neutral.

@@RebelKeithy it's actually 6 inputs (3 engage/disengage bits + 3 lock/unlock bits), so there are 64 possible configurations. I imagine many of them don't work

Its made to show how an actual automatic gearbox in the automotive world works.. and he did a damn great job

Technic motor doesn't have much torque to output extra power, use your mind to visualize other gear sizes

He is trying to show how an automatic gearbox in a car works (with torque converter, not dual-clutch). Automatic in that context does not mean it is switch automatically. But the actions his fingers do can be actuated by motors or a oil pressure system - without the driver doing anything. You can design a 4+R in a more compact design, switching inside the planetry gear. That's why these been a common concept in the 1970s - 2000s.

This is how an automatic transmission in a car works, what he is doing is just what the computer would do in a real one. But for sake of demonstration, he's doing the input manually. An actual manual transmission in a real car is constructed differently

You can buy individual parts from Bricklink

thanks for my answer

maybe bricklink

In your transmission, there are small 'motors' that have 2 positions. We'll say on/off position. Your transmission will read your speed, how much you are mashing the gas, and load (e.g. driving up an incline). When he turns a switch, that is what the solenoids are doing. The solenoids will lock/unlock clutch bands to hold or release gear sets to get a different gear ratio. Its quite a marvel of technology. If you want your brain to hurt more, study a torque converter and how it can litteraly multiply torque. They were once called 'fluid couplings' and they can either treat fluid as a fluid OR a solid. Its crazy stuff!:)

@@longbow6416 thanks for your answer. I know how a automatic Transmission works. My question was, what in this Video was automatic. He changes the gears manually without a clutch. I thought the gears will switch automaticly. What ever...

@@hondavfr800 the gear setup is 'automatic', im not aware if any manual uses planetary gears. My wife's Ford Focus has that wierd transmission that uses like a manual gear box (gears on rods), but solenoids activate 1 of 2 clutches to shift gear sets automatically. I love my Fords but I dont know if its a step foward or backward.. If you know of any car manufacturer that uses planetary gears in a manual, let me know!

@@hondavfr800 It contains the same type of gears and methods to select ratios as an automatic gearbox in your car would have.

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